LIGHTING SYSTEM Headlight Signal Circuit

DESCRIPTION

The headlight leveling ECU assembly detects the status of the low beam headlights.

WIRING DIAGRAM

B005XXZE06
*a No. 1 Integration Relay
*b Headlight Leveling ECU Assembly

CAUTION / NOTICE / HINT

Note

First check that the low beam headlights operate normally.

PROCEDURE


  1. READ VALUE USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / HL Auto Leveling / Data List.

    5. Read the display on the GTS.

      HL Auto Leveling
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Lo Beam St Low beam headlight state/ON or OFF

      ON: Low beam headlights on

      OFF: Low beam headlights off

      		 -
      OK
      Normal conditions listed above are displayed.

    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    NG

  2. CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - HEADLIGHT LEVELING ECU ASSEMBLY)


    1. Disconnect the A48 headlight leveling ECU assembly connector.

    2. Disconnect the 1G No. 1 integration relay connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      A48-3 (HDLP) - 1G-11 (HL4B) Always Below 1Ω
      A48-3 (HDLP) - Body ground Always 10 kΩ or higher

    OK

    REPLACE HEADLIGHT LEVELING ECU ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR